The key advancements in exploring luminescence mechanism of ZnO nanocrystals have been made by Physics School of in Zhengzhou University(ZZU), with the research paper entitledMultiphoton Excited Singlet/Triplet Mixed Self-Trapped Exciton Emissionpublished in the internationally renowned journalNature Communications. The first authors are Zhou Rui, doctoral student in condensed matter physics, and Sui Laizhi, associate researcher at Dalian Institute of Chemical Engineering. The corresponding authors are Associate Prof. Liu Kaikai and Prof. Shan Chongxin.